Moody D B, Stebbins W C, Iglauer C
J Exp Anal Behav. 1971 Jul;16(1):105-11. doi: 10.1901/jeab.1971.16-105.
Two monkeys were trained to press and hold a response key in the presence of a light and to release it at the onset of a pure tone. Initially, all responses with latencies shorter than 1 sec were reinforced without regard to the frequency of the pure tone, and the intensity of the pure tone that resulted in equal latencies at each frequency was determined. The second stage of the experiment consisted of discrimination training, during which releases to one pure-tone frequency (positive stimulus) were reinforced and releases to a second frequency (negative stimulus) were extinguished. Median latencies to the negative stimulus slowly increased as did the variability of the latency distribution for the negative stimulus. There was no evidence of a concurrent decrease in latencies to the positive stimulus indicative of behavioral contrast. The third part of the experiment consisted of determining maintained generalization gradients by increasing the number of nonreinforcement stimuli. The gradients that eventually resulted showed approximately equal latencies to all frequencies of the negative stimulus and shorter latencies to the positive stimulus frequency.
训练了两只猴子，使其在有灯光时按压并按住反应键，并在纯音开始时松开。最初，所有潜伏期短于1秒的反应都得到强化，而不考虑纯音的频率，并确定了在每个频率下导致相等潜伏期的纯音强度。实验的第二阶段包括辨别训练，在此期间，对一种纯音频率（正性刺激）的松开反应得到强化，而对第二种频率（负性刺激）的松开反应则被消退。对负性刺激的中位潜伏期缓慢增加，负性刺激潜伏期分布的变异性也如此。没有证据表明对正性刺激的潜伏期同时减少，这表明存在行为对比。实验的第三部分包括通过增加无强化刺激的数量来确定维持的泛化梯度。最终得到的梯度显示，对负性刺激的所有频率的潜伏期大致相等，而对正性刺激频率的潜伏期较短。
